A Mechanistic Study of a High Contrast Non-Lith SystemFootnote
Paper presented at a symposium on “Photography in the Printing Industry” organized by the Scientific and Technical Group of The Royal Photographic Society, 13-16 September 1983 at New College, Oxford.

D. BeaumondKodak Limited, Headstone Drive, Harrow, MiddlesexHA1 4TY

M.C. LloydKodak Limited, Headstone Drive, Harrow, MiddlesexHA1 4TY

B. ThomasKodak Limited, Headstone Drive, Harrow, MiddlesexHA1 4TY

Abstract

Heterocyclic compounds which form insoluble silver salts are commonly used in photographic developers to control the growth of fog density. Using a model film/developer system it has been found that some of these compounds can in addition discriminate between areas of low and high exposure with the result that high contrast similar to that obtained from lith development is achieved. This offers the potential to obtain high contrast development from a stable high-sulphite developer. The mechanism has been investigated by using sensitometric and electrochemical techniques. The results for two typical compounds, 5-methylbenzotriazole and 5-nitroindazole. are presented and discussed.

Notes

Paper presented at a symposium on “Photography in the Printing Industry” organized by the Scientific and Technical Group of The Royal Photographic Society, 13-16 September 1983 at New College, Oxford.

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A Mechanistic Study of a High Contrast Non-Lith SystemFootnote
Paper presented at a symposium on “Photography in the Printing Industry” organized by the Scientific and Technical Group of The Royal Photographic Society, 13-16 September 1983 at New College, Oxford.

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A Mechanistic Study of a High Contrast Non-Lith SystemFootnotePaper presented at a symposium on “Photography in the Printing Industry” organized by the Scientific and Technical Group of The Royal Photographic Society, 13-16 September 1983 at New College, Oxford.

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A Mechanistic Study of a High Contrast Non-Lith SystemFootnote
Paper presented at a symposium on “Photography in the Printing Industry” organized by the Scientific and Technical Group of The Royal Photographic Society, 13-16 September 1983 at New College, Oxford.